Ahead of party's campaign for the European and local elections, Ed Miliband has pledged rent controls if he came to power.
MP for the Henley Constituency John Howell, who has worked on redevelopment for the area, has tweeted that rent controls will "hurt the needy."
Evidence demonstrates rent controls lead to poorer quality accommodation, fewer homes being rented and higher rents – hurting the needy
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Greater Manchester Police said "inquiries are ongoing to fully understand the circumstances of the incident."
The US president enjoyed rousing support for his political agenda as a formerly hostile audience cheered his plans in office to the rafters.
The former leader said the party needed to learn lessons after his successor Paul Nuttall failed to unseat Labour in a hard-fought campaign.